participates in inflammatory response phospholipase C-activating G protein-coupled receptor signaling pathway memory visual learning regulation of vasoconstriction regulation of vascular permeability positive regulation of vasoconstriction histamine H1 receptor Homo sapiens protein histamine H1 receptor (human) Reactome:R-HSA-390908 A histamine H1 receptor that is encoded in the genome of human. Category=organism-gene. DTO:02100230 hHRH1 HRH1 PR:P35367 HH1R (human) H1R (human) UniProtKB:P35367 protein